If 25% of a book is 40 pages long, how long is the whole book?
25%= 25/100 = 1/4
Percent means over hundred. How many cents are in a dollar a hundred. So per-cent is over-hundred.
Total number pages of book = T
T/4 = 40
Multiply both sides by 4
You get
T=160
The book is 160 pages long.
Just practice. You will be a pro with practice. I was absolute trash at doing problems like these when I was younger. Now after doing thousands like them, I am a pro. Not a genius a pro.
tysm life saver
oooo good job bro. to me, ur an Einstien
To find out how long the whole book is, we can use the concept of proportions.
First, we know that 25% of the book is 40 pages. We can set up a proportion to find out how many pages 100% of the book would be.
Let's let x represent the length of the whole book.
The proportion can be set up as:
25/100 = 40/x
To solve this proportion, we can cross-multiply and then solve for x.
25x = 100 * 40
25x = 4000
Dividing both sides by 25, we find:
x = 160
So, the whole book is 160 pages long.